JPH11302055A - Tile mortar composition for tile prefabricated precast board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a tile mortar compsn. for a tile prefaricated precast board enhancing the sticking performance of a tile obtd. by a tile prefabricated method and having performance to relieve strain due to differential movement between tile mortar and body concrete. SOLUTION: The tile mortar compsn. contains (P) a polymer emulsion obtd. by emulsion-polymerizing a mixture contg. an unsatd. monomer having a carboxyl group and at least one unsatd. monomer selected from acrylic esters and methacrylic esters and giving an unsatd. copolymer having 220-270 K glass transition temp. calculated by a weight fraction method from the unsatd. monomers with an emulsifier contg. a molecule having an ethylenically unsatd. bond and a polyoxyalkylene group, (C) a hydraulic inorg. material and (S) an inorg. admixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic composition useful as a tile mortar for precast tile precast boards.

[0002]

2. Description of the Related Art It is effective from the viewpoint of protection and aesthetics of a building to attach a tile represented by a ceramic to the wall of a concrete structure. However, on the other hand, such sticking of tiles has always led to the problem of tile peeling accidents. Regarding the prevention of tile peeling, improvement measures have been proposed from various angles. For example, in order to improve the adhesion between the tile and the tile mortar, a back coating method for suppressing the water absorption of the tile (JP-A-55-78759, JP-A-5-19561)
No. 3, JP-A-7-82054), suppression of the skinning phenomenon of tile mortar (JP-A-58-138768, JP-A-62-213050), improvement of the sole of the tile, and the like. Flakes have dropped dramatically.

On the other hand, a method of providing irregularities on the surface for the purpose of imparting a mechanical effect for improving the adhesion between the tile mortar and the foundation concrete (Japanese Patent Application Laid-Open Nos. 60-108381, 60-264351, 60-264351, JP-A-4-202037) and a method utilizing fibrous entanglement (Japanese Unexamined Patent Publication No.
2-95726, JP-A-52-101227, JP-A-56-120590, JP-A-6-227848,
Japanese Patent Application Laid-Open No. 8-175883) has been proposed. In addition, the underlying concrete, which is the cause of spalling, removes moisture from the tile mortar (dry-out phenomenon),
Based on the idea that poor curing at the interface leads to peeling, a method of applying an emulsion in advance so that moisture is not removed from the substrate (Japanese Patent Publication No. 44-18775, Japanese Patent Application Laid-Open No. 56-970)
No. 55) and a method of mixing an emulsion into a tile mortar to obtain adhesion (Japanese Patent Laid-Open No. Sho 52-4142).
No. 8, JP-A-53-28626, JP-A-53-133
No. 228, JP-A-53-134821, JP-A-55-134
No. 350, JP-A-55-109254, JP-A-58-109
No. 69763, JP-A-63-303838, JP-A-5
JP-A-306158) has been proposed, and the effect has been improved. However, since the relationship between the resin properties and the adhesion of the emulsion is not clear, some emulsions exhibit no performance at all.

According to recent research results, as one of the causes of peeling, a difference (differential movement) between deformation amounts (dry shrinkage and thermal expansion) of each layer forming an adhesion layer is caused by deterioration of adhesion at each layer interface. (JP-A-3-295875
It has been clarified that it is caused by the conventional peeling prevention method. Furthermore, while the curtain wall method is becoming widespread, the method of bonding tiles has also been different from the past. In other words, the conventional tile application involves applying a tile mortar to a hardened concrete base and applying the tile before hardening. However, in many cases where precast concrete boards used for curtain wall construction are made, tiles are installed on the formwork surface, a tile mortar layer is poured from above, and concrete for the skeleton layer is further poured. The target product is obtained by the tile pre-installation method. Therefore, despite the fact that the adhesion mechanism of the tiles is naturally different, the current situation is that products are manufactured by applying the conventional concept as it is.

[0005]

In view of such circumstances, the present invention improves the adhesion performance of tiles obtained by a tile pre-adhesion method and has the ability to alleviate distortion caused by differential movement between tile mortar and concrete. It is an object of the present invention to provide a tile mortar composition for a tile precast plate.

[0006]

In order to achieve the above object,
The tile mortar composition for a precast tile precast board of the present invention comprises (P) an unsaturated monomer having a carboxyl group and at least one unsaturated monomer selected from an acrylate and a methacrylate. A mixture in which the glass transition temperature of the unsaturated copolymer calculated from the saturated monomer by the weight fraction method is 220 to 270 K is prepared using an emulsifier containing a molecule having an ethylenically unsaturated bond and a polyoxyalkylene group. It is characterized by containing a polymer emulsion obtained by emulsion polymerization, (C) a hydraulic inorganic material, and (S) an inorganic admixture.

Further, in the tile mortar composition for precast tile precast boards of the present invention, the average particle diameter of the (P) polymer emulsion is preferably 30 to 200 nm.

Further, in the tile mortar composition for a precast tile precast board according to the present invention, (P) the unsaturated monomer mixture used in the polymer emulsion may be:
It is preferable that the content ratio of the unsaturated monomer having a carboxyl group is 0.1 to 10% by weight based on all the unsaturated monomers.

According to the present invention, a tile mortar for pre-casting a precast plate which has such a structure and has no problem of adhesion and can reduce the distortion of the interface due to the differential movement which is the cause of peeling. can do. Such excellent properties of the present invention are such that the dispersion state of the mortar comprising the (P) polymer emulsion, the (C) hydraulic inorganic material and the (S) inorganic admixture is good, and the structure of the obtained cured product is uniform. This is because the toughness is significantly improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION First, (P) used in the tile mortar composition for precast tile precast board of the present invention.
The polymer emulsion will be described.

In general, it is known that various properties of a polymer greatly change in a transition region represented by a glass transition temperature. In the present invention, the glass transition temperature of the polymer is from 220 to 270K, preferably from 250 to 270K.
It is necessary to be. When the glass transition temperature exceeds 270K, stress increases in the adhesion performance,
The ability to alleviate the strain generated at the interface due to the expansion decreases, and the adhesion durability deteriorates. On the other hand, below 220K
Although the strain relaxation property is improved, the cured hydraulic composition has an extremely low Young's modulus, deteriorates creep property, and is not preferable because tile mortar is easily deformed.

In the present invention, the glass transition temperature is calculated from the unsaturated monomer by a weight fraction method. Specifically, the glass transition temperature is expressed by the following formula (1). The glass transition temperature (Tg) calculated by the weight fraction method based on the equation.

[0013] _{1 / Tg = W 1 / Tg} 1 + W 2 / Tg 2 + ···· + W n / Tg in _n (1) (the equation (1), Tg is the glass transition temperature of the copolymer (K) , Tg _n is the glass transition temperature of a single copolymer of an unsaturated monomer _n (K), Wg n is the weight fraction of the unsaturated monomer n)

The average particle size of the polymer emulsion (P) is preferably from 30 to 200 nm. If the average particle diameter exceeds 200 nm, the specific surface area of the polymer becomes small, and it becomes impossible to effectively chemically modify carboxyl groups or polyoxyalkylene groups on the polymer surface. Is significantly increased, and handling during production and use becomes difficult. The average particle diameter is more preferably 50 nm or more, and 150 nm or less, and more preferably 1 nm or less.
00 nm or less is more preferable. By using a polymer emulsion having a small average particle diameter and a glass transition temperature of 220 to 270 K, tile mortar characteristics such as adhesion and relaxation of differential movement are improved.

(P) The unsaturated monomer used in the polymer emulsion includes an unsaturated monomer having a carboxyl group,
And at least one unsaturated monomer selected from acrylates and methacrylates.

As the unsaturated monomer having a carboxyl group, an unsaturated carboxylic acid is preferable, and specifically, acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid and the like can be used. . Among these, at least one selected from acrylic acid and methacrylic acid is more preferable. In the case of dicarboxylic acids such as maleic acid, fumaric acid and itaconic acid, these monoesters and monoamides may be used.

The acrylate and methacrylate are not particularly limited, but alkyl acrylate and alkyl methacrylate are preferred. In this case, the alkyl group has 1 to 1 carbon atoms.
18 are preferred, and more specifically,
Methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, octyl methacrylate, 2-methacrylic acid Ethylhexyl and the like can be used.

These unsaturated monomers may be used alone or in an appropriate combination of two or more.

(P) In the unsaturated monomer mixture used for the polymer emulsion, the unsaturated monomer having a carboxyl group is contained in an amount of 0.1 to 10% by weight of the total unsaturated monomers.
It is preferable that More preferably 1-3% by weight
It is. If the content exceeds 10% by weight, the water resistance of the film may be lowered or the cement hardening reaction may be inhibited. If the content is less than 0.1% by weight, the adhesion performance due to the chelating effect of the carboxyl group is sufficiently exhibited. It is not done. By introducing a carboxyl group at an appropriate ratio, good cured body performance and the like can be obtained.

The admixture containing these unsaturated monomers has a plurality of functional groups in one molecule in order to improve the performance derived from the resin film such as strength, water resistance and chemical resistance. It is preferable to carry out copolymerization by including a crosslinking agent. As the crosslinking agent, trimethylolpropane trimethacrylate, glycidyl acrylate, glycidyl methacrylate, bisphenol A polyoxyethylene adduct diacrylate, bisphenol A polyoxyethylene adduct dimethacrylate, triallyl isocyanurate, N-
Methylol acrylamide, N-methylol methacrylamide, divinylbenzene and the like can be used. Among these, N-methylol acrylamide, N-methylol methacrylamide or trimethylolpropane trimethacrylate is preferred. The cross-linking agent is preferably used in the range of 0.1 to 5% by weight of the unsaturated monomer.

Further, in this mixture, unsaturated monomers other than those described above, for example, styrenes such as styrene and α-methylstyrene, dienes such as butadiene and isoprene, vinyl acetate and the like, as long as the performance of the polymer emulsion is not impaired. And vinyl esters such as vinylpropionate, and nitriles such as acrylonitrile and α-methylacrylonitrile.

(P) As the emulsifier for emulsion polymerization of the polymer emulsion, an emulsifier having a molecular structure having an ethylenically unsaturated bond and a polyoxyalkylene group is used. The reason for defining the emulsifier to be used in this manner is that since the decrease in the water resistance of the cured product due to the free emulsifier is suppressed, the deterioration is accelerated through moisture in the cured product.
This is because an effect of suppressing neutralization and the like can be obtained. The number of ethylenically unsaturated bonds is preferably one in the molecule, and the polyoxyalkylene group is preferably one having an average of 3 to 100 moles of an oxyalkylene group having 2 to 3 carbon atoms added. The average number of moles of the polyoxyalkylene group added is more preferably 5 to 40 moles. As such a reactive emulsifier, specifically, for example, anionic or nonionic emulsifiers represented by the following chemical formulas (1) to (8) can be suitably used.

[Example of anionic emulsifier]

[0024]

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[0025]

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[0026]

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[0027]

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[0028]

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[0029]

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[0030]

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[Example of nonionic emulsifier]

[0032]

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(In the above chemical formulas (1) to (8), A
Is an alkylene group having 2 or 3 carbon atoms (eg, -CH ₂
—CH ₂ — and / or —CH ₂ —CH (CH ₃ ) —), M ¹
Is a monovalent or divalent cation, n is a number of 3 to 100, preferably 5 to 40, m is a number of 0 or 1, R ⁰ is an alkyl group having 6 to 18 carbon atoms (for example, octyl group, A nonyl group), an alkenyl group or an aralkyl group (arylated alkyl group), R ¹ is a hydrogen atom or a methyl group, and R ² is a phenyl group having an alkyl group, an alkenyl group, an alkyl group or an alkenyl group having 1 to 30 carbon atoms. Or a fatty acid residue, R ³ is a methylene group, an ethylene group or a phenylene group)

The reactive emulsifier may be used in combination with one or more emulsifiers selected from other anionic emulsifiers and nonionic emulsifiers. Specific examples of emulsifiers that can be used in combination are shown below.

[Representative example of anionic emulsifier] Polyoxyalkylene alkylaryl ether sulfonate sulfate represented by the following chemical formula (9)

[0036]

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A polyoxyalkylene alkyl ether sulfate salt represented by the following chemical formula (10)

[0038]

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A polyoxyalkylene alkylaryl ether sulfate salt represented by the following chemical formula (11)

[0040]

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(In the above chemical formulas (9) to (11),
R ⁴ is an alkyl group having 6 to 20 carbon atoms, A, n and M
¹ is the same as above)

[Representative example of nonionic emulsifier] Polyoxyalkylene alkylaryl ether represented by the following chemical formula (12)

[0043]

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A polyoxyalkylene alkyl ether represented by the following chemical formula (13)

[0045]

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(In the above chemical formulas (12) and (13), A, n and R ⁴ are the same as described above.)

Among them, the emulsifier used in combination is preferably an anionic emulsifier having an oxyalkylene group such as an oxyethylene group and an oxypropylene group in the molecule.

The mixing ratio of the emulsifier other than the reactive emulsifier is as follows:
It is preferably at most 60% by weight of all emulsifiers. If the compounding ratio other than the reactive emulsifier exceeds 60% by weight, the steric repulsion effect on the cement particles by the polyoxyalkylene group becomes dominant, the chelating effect by the carboxyl group is inhibited, and the affinity with the cement particles is lowered. , High adhesion performance cannot be obtained.

It is preferable that the emulsifier is blended in an amount of 0.5 to 10% by weight based on the total amount of the unsaturated monomers to carry out emulsion polymerization. More preferably, it is 1 to 5% by weight. 10
If the content is more than 0.5% by weight, the adhesion performance and the performance of the cured product may be reduced. If the content is less than 0.5% by weight, it is difficult to obtain a polymer emulsion having a desired particle diameter.

In the present invention, miscibility and adhesion can be adjusted by introducing a suitable amount of the reactive emulsifier as described above and introducing a polyoxyethylene group into a carboxyl group at an appropriate ratio. .

(P) As a polymerization initiator for emulsion polymerization of a polymer emulsion, for example, hydrogen peroxide alone, a combination of hydrogen peroxide and a carboxylic acid such as tartaric acid, citric acid, and ascorbic acid; And oxalic acid,
Sulfinic acid or a salt thereof, in combination with an oxyaldehyde or a water-soluble iron salt, and further, a persulfate,
Percarbonates, peroxides such as perborates, or 2,2'-azobis (2-aminodipropane) and its salts, 2,2'-
Water-soluble azo initiators such as azobis (N, N'-dimethylene-isobutylamidine) and salts thereof, and 4,4'-azobis (4-cyanovaleric acid) and salts thereof can be used. In preparing the polymer emulsion (P) used in the present invention, the water-soluble azo initiator is used in an amount of 0.1 to 3% by weight based on the amount of the unsaturated monomer constituting the polymer emulsion.
It is preferable to use within the range.

The (P) polymer emulsion used in the present invention can be prepared by the following general emulsion polymerization using an unsaturated monomer, an emulsifier and a polymerization initiator as appropriate. That is, a monomer dropping method in which an emulsifier is dissolved in an aqueous phase, a part of an unsaturated monomer mixture is emulsified and solubilized, a polymerization initiator is added, and then the remaining unsaturated monomer is dropped as it is. Emulsifier, or a method in which a part of water and an unsaturated monomer mixture are previously mixed and emulsified, and emulsion polymerization is carried out by a pre-emulsion method in which the emulsion is dropped, but a polymerization vessel which is a disadvantage of emulsion polymerization can be prepared. The pre-emulsification method is preferred from the viewpoint of reducing the amount of the polymer adhered to the blades and stirring blades.

The (P) polymer emulsion used in the present invention has a viscosity of 50 to 200 cP at a solid content of 40% by weight.
(Brookfield viscometer method), the workability is good. In addition, those having a low viscosity can contain 50% by weight or more of a solid content.

Next, the hydraulic inorganic material (C) used in the tile mortar composition for a precast tile precast plate of the present invention will be described. (C) Hydraulic inorganic materials include Portland cement, fly ash cement,
Cement such as silica cement, blast furnace cement, gypsum cement, micro cement, alumina cement, semi-water,
Gypsums such as dihydrate and hexahydrate gypsum are appropriately used. Further, the cements may be any of ordinary hardening type, fast hardening type, quick hardening type, and ultra-fast hardening type.

Next, the (S) inorganic admixture used in the tile mortar composition for precast tile precast boards of the present invention will be described. (S) As the inorganic admixture,
Fine aggregate, recycled fine aggregate, silica sand, sea sand, mountain sand, river sand, mica,
Inorganic admixtures such as stone powder, glass powder, aluminum powder, silica fume, fly ash and blast furnace slag are preferably used.

In the tile mortar composition for precast tile precast boards of the present invention, the (P) polymer emulsion can be mixed with the (C) hydraulic inorganic material in the form of an emulsion obtained by emulsion polymerization. In this case, the mixing amount of the (P) polymer emulsion is 0.1% as a solid content with respect to 100 parts by weight of the (C) hydraulic inorganic material.
1 to 50 parts by weight is preferred. More preferably 2.5 to
10 parts by weight. If the amount exceeds 50 parts by weight, the inherent performance of the hydraulic composition may be impaired. If the amount is less than 0.1 part by weight, the polymer performance is not sufficiently reflected on the cured product.

The (S) inorganic admixture may be mixed with the (C) hydraulic inorganic material immediately before use, or may be a premixed one. The mixing amount of the (S) inorganic admixture is 50 parts with respect to (C) 100 parts by weight of the hydraulic inorganic material.
~ 400 parts by weight are preferred. More preferably 200 to
300 parts by weight. When the amount exceeds 400 parts by weight, the effect derived from the polymer emulsion is diluted, and the adhesion performance may be reduced. When the amount is less than 50 parts by weight, a defect of the hydraulic inorganic material appears, causing remarkable cracking and drying shrinkage. This is because it worsens.

In the tile mortar composition for precast tile precast boards of the present invention, the mixing ratio of water is preferably 30 to 60% by weight based on the hydraulic inorganic material (C).

The tile mortar composition for precast tile precast boards of the present invention contains lignin sulfonic acid (salt), resin acid (salt), higher fatty acid (salt), naphthalene sulfonic acid (salt) in order to enhance the performance of the cured product. ) Formaldehyde condensate, aromatic aminosulfonic acid (salt) compound, polystyrene sulfonic acid (salt), poly (meth)
Acrylic acid (salt) compounds, polyalkylene glycols, methylcellulose, hydroxyethylcellulose,
Known chemical admixtures for cement such as nitrite, 1-hydroxyethanol 1,1-disulfonic acid (AE agents, water reducing agents, fluidizing agents, defoamers, humectants, rust inhibitors, shrinkage reducing agents, etc.) and Pigments and the like can be used in combination. These chemical admixtures for cement can be used by premixing them in the polymer emulsion within a range that does not impair the performance of the polymer emulsion (about 3% by weight or less based on the hydraulic inorganic material (C)).

[0060]

The present invention will now be described in detail with reference to examples and comparative examples. In addition, "part" and "%" shown below
Are based on weight.

[(P) Preparation of polymer emulsion] (1) Polymer emulsion no. Emulsifier No. 1 shown in Table 2 was placed in a glass reaction vessel equipped with a thermometer, a stirrer, a reflux cooling pipe, a nitrogen introduction pipe, and a dropping funnel.
5.0 emulsifier and 140.0 parts of water are charged and dissolved in the emulsifier (1), and the system is replaced with nitrogen gas. Emulsion No. shown in Table 1 Of 100.0 parts of the unsaturated monomer mixture and 145.0 parts of the aqueous solution of the emulsifier previously dissolved.
0 parts are emulsified and mixed, and 5.0 parts of the mixture is added to the reaction vessel and the temperature is raised to 65 ° C. After the temperature was raised, 0.3 parts of 2,2'-azobis (2-aminodipropane) dihydrochloride was added to 0.1 ml of water.
The resulting mixture was dissolved in 8 parts, and added to the reaction vessel. Immediately, 145.0 parts of the residual unsaturated monomer emulsion was continuously dropped into the reaction vessel over 60 minutes, and polymerization was carried out at 65 ° C. After completion of the dropwise addition, aging is performed at 65 ° C. for 180 minutes to complete the polymerization.
After cooling to room temperature, the solid content was adjusted to 40%. It was set to 1.

[0062]

[Table 1]

[0063]

[Table 2]

(2) Polymer emulsion No. Nos. 2 to 8 Using the emulsifiers shown in Table 2 and the unsaturated monomer mixtures shown in Table 1, polymer emulsion Nos. Prepared according to 1.

[Confirmation of Properties of Polymer Emulsion] The average particle size of the obtained polymer emulsion was measured by a light scattering photometer (ELS-800 manufactured by Otsuka Electronics Co., Ltd.), and the viscosity was measured by Brookfield viscometer. The glass transition temperature of each unsaturated monomer in Table 1 was calculated by the above-mentioned Fox equation. The following values were used as the glass transition temperature of the homopolymer of each unsaturated monomer (unit: K).

Butyl acrylate: 219, ethyl acrylate: 249, methyl methacrylate: 378, methacrylic acid: 501, N-methylol acrylamide: 373

Examples 1 to 7 and Comparative Examples 1 to 3 [1. Thermal chill repetition test between tile mortar and skeleton concrete] Tile mortar having the composition shown in Table 3 was prepared,
Tile mortar is spread over a 30 × 30 × 10 cm formwork to a thickness of 5 mm. After standing for 24 hours, a first-class concrete having the composition shown in Table 4 was poured from above and cured for 28 days at a temperature of 20 ° C. and a humidity of 60% to obtain a specimen. This specimen was subjected to a repeated hot-cold resistance test in accordance with the Japan Society of Finishings Standard M-101 quality standard of the water absorption adjusting material for cement mortar application.
The bond strength and the fracture surface condition were determined every 00 and 200 cycles. The kneading property of the tile mortar and the performance test of the cured product of the tile mortar were performed by the following methods (the same applies to the following examples). Table 3 shows the results.

[Mixing property of tile mortar] The tile mortar was evaluated for kneading properties by measuring the following table flow value, SL flow value, and unit volume weight.

Table flow value This was carried out according to JIS R 5201 (physical test method for cement).・ SL flow value The Residential Urban Development Corporation was conducted in accordance with the special common specifications (7. Self-leveling floor material, 4.7 flow value).

Unit Weight The unit weight was measured according to JIS A 1116 (Test method for unit weight of concrete not yet solidified and test method for weight of air by weight method (weight method)).

[Performance test of cured product of tile mortar] Tile mortar was subjected to the following strength test to evaluate the performance of cured product. -Bending and compressive strength This was performed according to JIS R 5201 (physical test method for cement).

Adhesion Strength With respect to the test specimen after curing, the adhesion strength and the state of the fracture surface were measured using a Kenken-type tensile tester. In the case without a tile, a jig of 40 × 40 mm was used. When there were tiles, a jig suitable for each tile size was used.

The adhesion strength was 1.0 N / mm ²
The above was regarded as good, and the state of the fracture surface was determined to be good if the interface fracture was small.

[0074]

[Table 3]

[0075]

[Table 4]

Examples 8 to 9 and Comparative Example 4 [2. Evaluation of adhesion performance between tile and tile mortar)
Among the polymer emulsions used as examples in the test of the adhesion performance with the later-cast concrete, No. 1 was used. 5 were prepared as shown in Table 5 and commercially available tiles (45 two tiles, small flat tiles, three brick bricks)
Tile mortar was applied to the back surface of each of the samples to a thickness of 5 mm and cured for 28 days at a temperature of 20 ° C. and a humidity of 60% to obtain a test sample. The adhesion performance between the tile mortar and the tiles was evaluated by measuring the adhesion strength and the fracture surface condition of the specimen. Table 6 shows the results
Shown in In addition, as shown in FIG. 1, the specimen was prepared so that evaluation could be made for three types of only the concave portion, the convex portion, and the entire surface of the tile sole. That is, a specimen for evaluating the adhesive strength of only the concave portion was prepared by applying grease as a release agent to the convex portion of the tile, and a specimen for evaluating the adhesive strength of only the convex portion was tile. Was prepared by applying a release agent to the concave portions.

[3. Small scale adhesion performance evaluation test] 30
Spread 45 tiles on a formwork of × 30 × 10cm,
Among the polymer emulsions used as examples in the test of the adhesion performance with the later-cast concrete, No. 1 was used. For Example 5, a tile mortar shown in Table 5 was prepared, and the thickness was 5 m.
m, the tile mortar was poured, and the specimen without a blanket net was allowed to stand for 24 hours. Then, first-class concrete having the composition shown in Table 4 was poured from above, and the temperature was 20 ° C. and the humidity was 60%. The specimens that had been cured for 28 days under the above conditions were used as test specimens. On the other hand, for those with a standing blanket net, immediately after the construction of the tile mortar, the standing blanket net for the tile peeling prevention method is laid on the tile mortar,
After standing for a period of time, a first-class concrete having the composition shown in Table 4 was poured from above, and the mixture was placed at a temperature of 20 ° C. and a humidity of 60%.
The specimen that had been cured for 8 days was used as a specimen. With respect to the specimen, the adhesion strength and the breaking state of the tile were obtained, and the performance was evaluated. Table 6 shows the results.

[0078]

[Table 5]

[0079]

[Table 6]

Example 10 [4. Full scale adhesion evaluation test] 200 × 600
45 tiles were laid on a 40 cm formwork, and among the polymer emulsions used as examples in the adhesion performance evaluation test with post-cast concrete, No. For tile mortar No. 5 shown in Table 5, 1 is prepared, and a tile mortar is poured into the mortar so as to have a thickness of 5 mm. Immediately after the construction, a blanket net for a method for preventing tile separation is laid on the tile mortar and left for 24 hours. After the reinforcement for the skeleton was applied, the first-class concrete of the composition shown in Table 4 was poured in 20 cm, and the one that had been steam-cured at 60 ° C. overnight was exposed outdoors to obtain a specimen. After 6 months of outdoor exposure, the adhesive strength and the breaking condition were determined and the performance was evaluated. The measurement of the adhesion strength and the breaking state was performed three times. Table 7 shows the results.

[0081]

[Table 7]

From the above evaluation results, emulsion No.
The adhesion performance of the examples using the tile mortar composition containing Nos. 1 to 6 was good in both the adhesion strength and the fracture surface condition in each of the hot-cold repetition test, the adhesion test with the tile, and the small-scale adhesion test. Was. In addition, the emulsion no. As a result of preparing a full-scale wall using the tile mortar composition using No. 5, the adhesive strength was 1.23 N / mm ² , and the breaking condition was 0%, indicating excellent adhesive performance. Further, no cracks and no efflorescence were observed at the joints, and it was confirmed that the mortar composition of the present invention was most suitable as a tile mortar for pre-casting tile precast plates.

[0083]

EFFECTS OF THE INVENTION The tile mortar composition for precast tile precast boards of the present invention has better adhesion performance to hardened post-cast concrete, adhesion to commercially available tiles, as compared with the case of using a conventional tile mortar composition. Also, it is excellent in adhesion performance to repeated heating and cooling, and exhibits excellent effects in terms of crack resistance of the obtained mortar cured product and suppression of Efro.

[Brief description of the drawings]

FIG. 1 is a view showing a method of bonding between tiles and tile mortar in an example.

[Explanation of symbols]

 Reference Signs List 1 tile mortar composition 2 tile 3 release agent (grease)

Continued on the front page (51) Int.Cl. ⁶ Identification code FI E04F 13/08 101 E04F 13/08 101K // C04B 111: 21 (72) Inventor Takeshi Kawachi 4-640 Shimoseito, Kiyose-shi, Tokyo Stock Company Inside the Obayashi Technical Research Institute (72) Inventor Ichifusa Mitani 4-640 Shimoseito, Kiyose-shi, Tokyo, Japan Inside the Obayashi Technical Research Institute (72) Inventor Jun Nakane 4-640 Shimoseito, Kiyose-shi, Tokyo, Japan Inside the research institute (72) Yoshimasa Hayashi 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute

Claims (3)

[Claims] 1. A method comprising: (P) an unsaturated monomer having a carboxyl group and at least one unsaturated monomer selected from acrylic acid esters and methacrylic acid esters; A polymer emulsion obtained by emulsion-polymerizing a mixture having a glass transition temperature of 220 to 270 K of an unsaturated copolymer calculated by using an emulsifier having a molecular structure having an ethylenically unsaturated bond and a polyoxyalkylene group. And (C) a hydraulic mortar composition and (S) an inorganic admixture. 2. The tile mortar composition according to claim 1, wherein the polymer emulsion (P) has an average particle size of 30 to 200 nm. (3) In the unsaturated monomer mixture used in the polymer emulsion (P), the content of the unsaturated monomer having a carboxyl group is 0.1 to 10 in the total unsaturated monomers.
The tile mortar composition for a precast tile precast board according to claim 1 or 2, which is in terms of% by weight.